diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/MockSystemReader.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/MockSystemReader.java
index 3daaea90c..b9bc25857 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/MockSystemReader.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/MockSystemReader.java
@@ -48,6 +48,7 @@
 import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
 
@@ -144,4 +145,9 @@ public int getTimezone(long when) {
 	public TimeZone getTimeZone() {
 		return TimeZone.getTimeZone("GMT-03:30");
 	}
+
+	@Override
+	public Locale getLocale() {
+		return Locale.US;
+	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java
index 0b72ade50..595691573 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java
@@ -48,6 +48,7 @@
 import java.io.File;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import java.util.Locale;
 import java.util.TimeZone;
 
 import org.eclipse.jgit.lib.Config;
@@ -124,6 +125,11 @@ public int getTimezone(long when) {
 		public TimeZone getTimeZone() {
 			return TimeZone.getDefault();
 		}
+
+		@Override
+		public Locale getLocale() {
+			return Locale.getDefault();
+		}
 	};
 
 	/** @return the live instance to read system properties. */
@@ -196,4 +202,9 @@ public static void setInstance(SystemReader newReader) {
 	 * @return system time zone, possibly mocked for testing
 	 */
 	public abstract TimeZone getTimeZone();
+
+	/**
+	 * @return the locale to use
+	 */
+	public abstract Locale getLocale();
 }